code: def test_children_position_argument(self):
      self.widget(self.children)
  
imports: from unittest import TestCase
  from traitlets import TraitError
  from ipywidgets.widgets import Accordion, Tab, Stack, HTML
label_desc: Use image node_id 6 for calling the TestTab obj's underlying member method code with example usage: obj.test_children_position_argument() without return types